Name:_________________________________ Grade & Sec.:___________ Score:_______
Teacher:_______________________________ Date:__________________ Rating:______
Activity 1
How Can You Tell if a Mixture is Acidic or Basic?
Objectives
In this activity, you will:
1. Prepare a plant indicator from any of the following plants: violet
eggplant peel, purple camote peel, red mayana leaves or violet
Baston ni San Jose; and
2. Find out if a given sample is acidic or basic using the plant
indicator.
Part A. Preparation of Indicator*
In this part of Activity 1, you will prepare a plant indicator that
you will use to determine if a given sample is acidic or a basic.
Materials Needed
1 pc mature, dark violet eggplant or camote leaves of Mayana or
Baston ni San Jose
alum (tawas) powder
sharp knife or peeler
small casserole or milk can
plastic egg tray or small transparent plastic cups
brown bottle with cover
alcohol lamp
tripod
Procedure
1. Peel an eggplant as thin as possible. (You may also use the skin of
purple camote or the leaves of red mayana or Baston ni San Jose.)
Cut the materials into small pieces and place in a small casserole
or milk can. You may keep the flesh of the eggplant or camote for
other purposes.
2. Add about ⅓ to ½ cup tap water to the peel depending on the size of the
eggplant or camote used. Boil for 5 minutes. Stir from time to time.
3. Transfer the mixture into a bottle while it is still hot. There is no need to
filter, just remove the solid portion. The mixture may change if left
in open air for more than 5 minutes.